Laser sodium guide satellite full emission link compensation system

Abstract

The invention relates to the technical field of adaptive optical systems, in particular to a laser sodium guide satellite full emission link compensation system. The laser sodium guide satellite fullemission link compensation system comprises a first laser beam expanding system, a color selective mirror, a deformation mirror, a spectroscope, and a beam combining and beam expanding system which are arranged successively along an emission path, a second laser beam expanding system, a first beam shrinking device, a first wave front detector, a wave front detection and control system, and a reflecting mirror, and a calibration light source, wherein the first laser beam expanding system, the color selective mirror, the deformation mirror, the spectroscope, and the beam combining and beam expanding system are arranged in sequence along an emission path, the second laser beam expanding system is located in the incident direction of the beam combining and beam expanding system, the first beamshrinking device and the first wave front detector arranged successively are located on the reflection direction of the spectroscope, the wave front detection and control system is located on the reflection direction of the spectroscope, and the reflecting mirror and the calibration light source are arranged between the deformation mirror and the spectroscope. According to the laser sodium guidesatellite full emission link compensation system, distortions of sodium laser, abeam expanding transmission light path, and atmosphere turbulences are compensated by using a single deformable mirror,a double wave front detector and another laser with a different wavelength from the sodium laser to ensure that the sodium laser has good distribution characteristics and sodium guide satellite lightspot qualities when the sodium laser reaches a sodium layer.

Description

technical field [0001] The invention relates to the technical field of adaptive optical systems, in particular to a laser sodium guide star full-launch link compensation system. Background technique [0002] Sodium laser guide star technology refers to the use of a beam of laser whose central frequency can resonate with the transition line of sodium atoms to excite the sodium layer at a height of about 92km from the ground to emit resonant backscattered light, which is used as the guiding light source of the adaptive optics system and has sampling Highly advanced advantages. However, in practical applications, the wavefront of the sodium guide star laser beam will be degraded by interference from two aspects. First, when the laser power density is high, the thermal distortion of the optical element and the distortion of the optical path inside and outside the laser cavity caused by mechanical deformation will lead to distortion of the wave front when the laser oscillates an...

AI Technical Summary

Problems solved by technology

First, when the laser power density is high, the thermal distortion of the optical element and the distortion of the optical path inside and outside the laser cavity caused by mechanical deformation will lead to distortion of the wave front when the laser oscillates and transmits in the optical system. Leads to poor beam transmission quality factor

The second is that the laser will be disturbed by atmospheric turbulence during the upward transmission process, the laser wavefront distribution will be further distorted, the convergence characteristics will become worse in the sodium layer, the star point will spread, and the center intensity will decrease, that is, the angular width of the sodium guide star will increase and the brightness will decrease. , which in turn causes the main telescope adaptive optics system to increase the measurement wavefront error, reducing the effect of correction and high-resolution imaging

Images